| Field Name |
Data Description |
| Test Name |
Urea Nitrogen, 24 Hour Urine |
| Code |
Urea Nitrogen 24 Hour Urine., U Nitrogen Total 24H., U BUN 24 |
|
CPT Code |
84540 |
| Last Modified |
5/15/2018 2:22:00 PM |
| Test Name |
U24 Urea Nitrgn. |
| Synonyms |
Urea U, lithol, BUN, Nitrogen Balance Study, |
| Patient Preparation |
|
| Spec. Requirements |
Urine |
| Tube |
Plastic 24 hour urine container, no preservative |
| Collection Volume |
10 mL aliquot of entire collection |
| Storage |
Refrigerate, Ambient or Freeze 14 days |
| Routine TAT |
|
| STAT TAT |
N/A |
| Days Test Performed |
|
| Performed by BHS |
None |
| See Availability |
|
| Reference Lab |
LabCorp of America |
| Reference Lab Code |
003541 Urea Nitrogen, 24-Hour Urine |
| Clinical Use |
Renal function test; coarse nitrogen-wasting test on patients on hyperalimentation; indicate nitrogen balance in hyperalimentation; rule out tap of urinary bladder in amniocentesis, paracentesis |
| Reference Range |
|
| Critical Value |
|
|
|
| Testing Sample Type |
Urine (24 Hour) |
| Min Lab Testing Volume |
1 mL aliquot |
| Special Handling |
Record total 24-hour urine volume on the request form.
Collection:Refrigerate the specimen as it is collected. Instruct the patient to void at 8 AM and discard the specimen. Then collect all urine including the final specimen voided at the end of the 24-hour collection period (ie, 8 AM the next morning). Screw the lid on securely. Container MUST be labeled with patient's full name, date and time collection started, and date and time collection finished. |
| Lab Notes |
|
| Methodology |
Urease |
| Limitations |
Causes for Rejection: Improper labeling |
